Point estimate math

Question

Determine the point estimate of the population proportion, The margin of error for the following confidence interval.

lower bound is.439 upper bound is .721 n equals 1000

The point estimate is?

The margin of error is?

The number of individuals in the sample with specified characteristics is?

Answer 1

point estimate is the average of the upper and lower bounds = (0.439 + 0.721)/2 = 0.58

margin of error is the length of the confidence interval divided by 2 = (0.721 - 0.439)/2 = 0.141

number of individuals with specified characteristics = point estimate * sample size = 0.58 * 1000 = 580